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From: Sebastian Moeller <moeller0@gmx.de>
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Cc: bloat <bloat@lists.bufferbloat.net>
Subject: Re: [Bloat] ADSL, ATM drivers, bloat, education & confusion
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Hi JOnathan, hi Kevin,

On Jun 6, 2015, at 15:53 , Jonathan Morton <chromatix99@gmail.com> =
wrote:

> Ideally, one would read the raw sync rate out of the modem (there has =
to be a way to do that, since it is able to report it in the web =
interface), and use that to set cake's bandwidth parameter. You could =
update it periodically using "tc qdisc change ...".
>=20
> You will need to set the overhead calculation correctly, probably =
using "pppoa-vcmux" or similar, depending on precisely what =
encapsulation your ISP uses. If you're not confident about that, specify =
"conservative" to begin with.

	I can be of help to measure the overhead empirically, if you are =
willing to dedicate a few hours on an otherwise quiescent link to gather =
some ICMP data, just let me know.

Best Regards
	Sebastian

> Once you have that, you can experiment to see how much you need to =
reduce the raw sync rate to achieve full bottleneck control - hopefully =
not much, at most 1%.
>=20
> The same approach would also work for inbound if necessary, except =
that you would need to reduce the raw sync rate rather more.
>=20
> - Jonathan Morton
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